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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca0bb5d49953b664ae18bb0991327a7ab12e124865ec8fbd1c21962e2bef900e' 
  AND token = '5g5H8by1WGTCD/mklc/bZlV0Wbpln31vYH4VF7Nh3fA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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