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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d84f9583e4b22080cacd8192fa17dd1da3d97492a5d758158e2ac06119afbba' 
  AND token = 'EkHWuTP8ANlyIQoMxwfBpeXgIvLoIrmGvHBcqfiuSUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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