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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f650ae70a0330eb9b475c48b6b7da7c219e715bc93b205977242fac16a825349' 
  AND token = 'SaOOmfrpw74OKcts7x7F7qOSO73zxj3svCcCTJ0zZeE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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