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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be79573e1e322fd3dc99b0f99236d64460f1c19ddc6a6250f7b04e149b62eecc' 
  AND token = 'f75eKa2PcAMoSmdM0wuxWa9wfn5YwuPgMS6cENK+9vE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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