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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8861d9126a61594a9c1062f536cd1f432d39344ec0d0b00368eb05d02c050af2' 
  AND token = 'hBItNedxNYR1gVLdxB6FpmMDO4ksjIkr07a8Ale02Ls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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