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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56b11eda6c6e6462b6784e50eb48f675c46880827b032072a6662d74412f4917' 
  AND token = 'Og/mdkQKm2EQESpP9zRY3ZCJQNn9kwSjd0i1lgBH8g8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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