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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0aa620f9532ab076218e34746aec14cc9867dfb7cc6c94feaa86b08359c1f7d0' 
  AND token = 'qHihNviqNQ7akG3DR8OhqYBTOuTTSHPgJ6e9sj07S5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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