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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d808eeda9b126c7ded711868132198314237c3810395c173082b89b03480864' 
  AND token = 'iyVAHh9NIp6s0S6bUXBXf0fRUfFhhNSgg7Kda74e7aA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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