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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58d41c86166fe7a71ade75ff581e3c2f41b1859c1ff2f64b1f0ab8a952698a5a' 
  AND token = 'Qm1kBupFsOKlP7GfvUcWb0gLp0x8prDeG4MpUYhSdpk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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