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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '307949fc797a8a6ad5814acef7d99a7c3dc1886f864a9867cd0a193261cae32f' 
  AND token = '7z9XyiW9cv3nouBcJJuxdalyZjWc8RlA1U6993DplUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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