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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccca91b9df0124c40adff82f85c2cb3f05558598a653124c0d1c9ad00b1ea7ad' 
  AND token = '5cK07WoQ7xtmqocj+pnYdpLMmBse+Et+/itijh/Xk8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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