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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f158e915f246ead4663fe3cb49567362a505ef40de09c28d6316e14d39a47c0e' 
  AND token = 'el88zhI5D4x/R5B7ZjQmpH26xjEtLZnkYS6uX8+lMq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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