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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b4f9aed7c4417e85a1ea9a131f3f2d176dec5b05c17262cb1b1bb14cb5d0051' 
  AND token = '5BZa3OVZJuYMyL24r0cD/1FPZRRreY9+hT6uM15PzVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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