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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c22fcff43f15c5cd40a48c2bd0d6ad84d161bf2caf4d8185dc7cbfd36b76fa24' 
  AND token = 'OdWiCxI6XJ/ZFA3HCe9t2Vr1FT/ysmHx7emZ/X7RJxs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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