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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd51584fecdc1bfb7f6f7210d1bfa16839b26ecaa10a4a25a2e333724c813700a' 
  AND token = '7gyvdlO8PQ8L1lwHHQyasVa/9NX2vkXKUNHki//q5/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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