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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '406263a2972c2756aa215ad4a2338e3fd48ec5c91feb226d60f42898f544fc90' 
  AND token = 'KFKy3d6dBkkDvfERzGN9i1VG5z66v0mX36grcTuNRog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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