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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '129b5704a6a27469d251ae89f7c69f6b5460416098868b460c12cfe4fe7c3269' 
  AND token = 'CUjYCacm2cidTFAGieecwRbHA/yR4u2vxoFgAs0H1l8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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