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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79bfcbef1ab68cc11fc15da7588888d3b1a4d4d922f7d197b58584481d231705' 
  AND token = 'UttF3uV0SWA+q0hLRyiuj86ycC+MP2QT5M2l60D8O1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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