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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47d80e25008abeba6e86578a63da5e51647dd2ee5101fb4f1e2e57c4231c1a86' 
  AND token = 'Or34Bnd7G1HnumXHpisNuovJ7ZYwl5DRkUgqs5v4iBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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