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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8179f5dbf0abb4aab1f536c8febb91947591318f68cbcec8725de0a4ddbbeb93' 
  AND token = 'eR+YVWURPudJlV4MemfkqiYjnzagDqQ+cmp2Plt0AfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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