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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b04b2435e5d3ed2a6d7953eba04377a0cfac01371a2cdf589ce0209062bd5c87' 
  AND token = '6VOppMxm/6c94U6jZOK5S3ioccyd66B8BPIZbhXespY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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