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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75bbf8f68dce9dea31ca710a58826caee4c0a83ac4743182e3f84e0b19cec43a' 
  AND token = 'eNxdeqzgpD31EJ7Bv0OWw/MF4a4memxYD74tvtV71AM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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