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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5494d4087430709b57f37c05fadbf1f1dd5df3768bcd263ac9bd5bb608e393a4' 
  AND token = 'jzJ94z0PBbv1gril394whJBgXy532ZRT2hkwZsH86tM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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