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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fb9c29ba679b0e649d7fd4ff190c1e2cfc769b0c2945b4f508ed64294214b95' 
  AND token = 'VaKOb+rmPTN26AgJXEgT1nnSj7CU3H/yfvALsvDiAZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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