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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95a655674208ff1a0a760ebab27f7c11a00fe535cd56e3f7c147c70f109b7d2e' 
  AND token = '/HkuFyhaqOLJgx8IRYQciWbcyz7e6u1lrQ8xeyfjV80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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