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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b64cc963eba79a277e7ba871af0a815154db61b8c6c1e0cab66d4c0d246eecc8' 
  AND token = '7vsnzU6A4fuZqtrLJL8BO34mi4SMfuIppk15bPTktkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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