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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75e5d29e4e7570b5ffb2431e491a5b8326d49a51a724aa115bd22a1a8220d511' 
  AND token = 'vWX/J6RXzw6/3XCiXQNcQRbc0MDaowWRI0gRcUuglrw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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