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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef3b99bdea0a54548a7c78a9c9c32dd8c1c7550f183991d306b405a0ebb7de6c' 
  AND token = '/7XQ59nlO+vAEa5qHn0Tlwzq0Ss/ToEKm59mMJJviTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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