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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5d8c303aee66ecb47df3d458e65b27bf9802c21328c3db309734821a9e13d9b' 
  AND token = 'fSyBhx4Iika/BHQ/NuOreN+Bz8ryF/L49K9knmU20j0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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