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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '802ae1ebb9d50735e940c9ba01b8157ad2f494e338b47ee5c24df42f1d5b5988' 
  AND token = '4obf91xU7J0CLIOcmY/oarISPpcr3LLpONd+NM8KdYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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