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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a51eb6358a27966985cd9e0950fafb19912f4cdb615b1251c970db617e709411' 
  AND token = 'Ex9+O/GscpgVuW9rR6C/790Sg0Kv1zmyf7PDDYDdUTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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