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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cf1b4f5d49357d8cd1303ab513f9add61104b6b94b1d9f2e9933a0a74a9178e' 
  AND token = '/u9UVcfh2EHsPRbadILSqJsj1M/kGQmtbqIA6baBj80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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