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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6c561e9307eb20201abdd14e487ba029300f3dfd937b714c3a6fd8b6d6504f8' 
  AND token = 'wdLB232/F6+8HnNGHBqE2mr46qnQc2NZELuMZ+vEcMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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