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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27aef8979921f10957555c75411b3658d1197133a73a74fe60b48fd6b2b8f4f7' 
  AND token = 'EWengyRnxc4W0IGrmXEzxkUYIMEsnu6PEGSu2g3FvGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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