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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '867f35eea6a5d969cb0403b202039b530ea4e955a67f289d40ffa9bd680351f7' 
  AND token = 'ee9wxh2Ayu4eyI3NFxLCyd6sL8Fm+PesORYJlx9/qSg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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