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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe58a998b76fb0f71e165f7b2288b58c5d5bf4494b9c5a10807d5957fff12746' 
  AND token = 'xzFEXA2BDczfooxUdjn+IarBjLQLtSI/lG/Kb8W03k4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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