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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eaa8aba48da293dd98cca404f8614e8ec8fe020fbbb0264b4f77522a9d5e6a90' 
  AND token = '6nlGKZbzYD+9bDTEKhIakdAj84IIP9CWrjlj28F2iDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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