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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a93ac5cca2d8b52231f52dfeb911b059806a8519432f56ac2a82f877c01f3c8' 
  AND token = 'qLiwTncurKHOpYJLbT62Z0n0fjWOWOR8s8irHJrTRHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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