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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ec61b75f43509ec1b82fb45e1837267ae698d77ae932ac8464cae05cf3f4b32' 
  AND token = 'jRuF86IkAvBd7S9btcF0ieJO/HrmB5ipDLBDQM+GEhk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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