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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c158fe97885582e5d4890dbee687b0fd48cbbf36c4fde51df4913a056c15e47' 
  AND token = 'iBEWVriH41xe7qXiVcCiZlNpbsRbzXeHTxqk5lfLmVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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