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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3924ff24da3f0ae10443fe59dad1c0a3410e655e86f312e0d1a22f821a58d655' 
  AND token = 'X9OfabHIs0p4Aa1xgZitYdVqScwFVuE+z3uAolB4A1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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