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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dd3ffb7715ed933547e108d5efc9328b519df5a768b90a94ea1505b68db7b69' 
  AND token = 'tjkdeevVa7AgozNet9QFKLu2F0KkAVroBkDSU44KlIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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