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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e92be2c02a082e6c1525278e7e3923a5e6837cf0daff3d594d244d1508c5a448' 
  AND token = 'YsfyJYRMITuK1pBLH60kOU4UDMsrGJIgGOOr1MxKXDI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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