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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9cc4a2e6c5826ffbce8b2990b951e9fb72b7081cffbb36b7ca7e51c4367a36a' 
  AND token = 'Q70rZL9wWVugnaLeqyxGSa0A8V/3ymxu0gSBnQNmCF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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