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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87e4a522f07e74842820bcf4cb1cea4999110c6f1b2ec8453e0e8a4f7ce60be9' 
  AND token = '6lcIvRFS228NoPMrVX/NrddY58EipX7cuAiHAdV5ao0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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