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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a075d89ed3606f186931754275e6e8dc32becf3e963a6ffd3f4bee03931cd91a' 
  AND token = 'VzfFxFFrlo6U5aALm40ftCWwwZyZXscxzQWJ+WzBDUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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