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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3a5c1a0aa6eea43818f0151837ab6760f2557c2eda88cc73cc7d174f2f951b9' 
  AND token = 'IfZ1aesld6Flnw2DDGpeKgfMrpHcYbKYQEapORial3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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