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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '462b39cc99b0988e79f60849540c319e85b312189f614c633bb1e4e6698ec31b' 
  AND token = 'dTZCBncmWroACPeny732YcHuJFCIxsZhpDEEVtr7x+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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