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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '002e22efcc8d502f2afc59276d21aa1584b5cd46c4cd322a098430d05f64919e' 
  AND token = 'pYup3oIeSVVdwfiHVb9tR0XDhyOm84mASp3F2YPwJ68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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