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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a29d5e7d512aadde3a0a51a62bd48d9ac3eb6ba74117c3b50540065af21cfbfc' 
  AND token = 'GwA5COMo1Q8N+l8jNmGsVAlSYiI+YW3xa1KHxIxpWtI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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