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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08a1fc1026c9a29853c2c94e4d20f501b6e8cc64eca92ba298095c64481570b5' 
  AND token = 'L24GoP7m649AesXfmT18Lzc2/giTnxeHWto80v4gZ1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}