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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20e8f9d490d936e2d891379468f033a2f21c81873ab23149b98638d3cb9ab2dd' 
  AND token = 'vY8mne8/hpi4AnyhtBrztMjP6Csomgf5F4RXpFh1XIc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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