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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddebbe3c040355544e21b45c957f3393ec251f308bed515c0492fd8e696dfc91' 
  AND token = 'B8e+WXlWSKrDXeRpBbnegZ2dt3cnZdNE3nt34Otv/ko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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