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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09d7b28b11bb5b5545d3b22fbc7031a2dd8bcbb2ca330ab477ab89aab87f9ad0' 
  AND token = 'GZY4TiZDHZ2Vds0ufCiZad2ptH0B5skodoPYTrCydS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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