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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cff479e9c09fae8372977129c68d9e64ee0f759a84c6f36305e0764863a9c23' 
  AND token = 'kkrRAi0yCGt43bqomd8pvswCLujNBxFlwCorHIXmmIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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