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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '108f43d38f830e005e90b3e2cc4e91e8b36122151a20a23aa1e497df0b9c844b' 
  AND token = '/uxF9ezYslgKIKKo1Q7Lk4hQ6doDMso4y8bIdiH7jag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00127

JSON explain

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