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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1473003fa4a6f91c10a2f2cd238797bbf4e3083ef32c093d822741e7d4402992' 
  AND token = 'lxD0t4HVQKUc6ri+ODmDxAIgmuVC85AYkyKm0wwzCNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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