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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '610c2ba527da3cce6b4ffd10978e3e255437a169128efea786885f197bd910a3' 
  AND token = 'XeM6pk5xEc0U3Cel0u4HgX+h//10uHgLQGCcdR73mE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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