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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '070db2f4cbfb94da9e647d5053c6c7daf9cc83955ae7c04096d6e6d60576123c' 
  AND token = 'bcCeFwJ/3iCy+xtq6HeElV6xZL8+fQI91enqP7Bnxc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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