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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02a8febce8076790624b3903e3cb8f0e461c6bedb8379a2b10c619257b830b33' 
  AND token = '5+bm1meRCdOVTj+tXI3I4p5xRhePy/4QUUVm793DwSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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