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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e72e00a7f3930ef29abfa6e59dbb88473b133c28a68d6862117f24b2b350b71' 
  AND token = 'OEiPh7RMBm6P695VBycs9am9YlSlorINiPrAXOOc/7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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