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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a3c76b077243d1ec79d3d2bd48b88a06e750c5b756fc6324f7a537b14a9d49b' 
  AND token = 'fr7X0V4IqklKtkvBNDsyAmWYq5VCufSxnkAIFlQtWNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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