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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f2c194863bdd98ebf246d2bd28b936fe21785b0341e238b9e006a13d846cf68' 
  AND token = 'ag5fbqeIbaNyjPGA97xf2bdwloCydKqRELVSDEy18WQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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