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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99f4375b6733c8757c9872124a1d72b2c424bb6b796bdd1b2c5173f3e9ce794f' 
  AND token = 'CTi3Pd6U8WDDCB3sLqq5lwtVmNPcZalcPcMbyLwVHGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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