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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '955e68a356faa9d2b980dbd4bbf90293e48b7f7ec280efa8848dc1a200d00b2d' 
  AND token = 'R+b+i9XecAt5GTltJ/7/SNcl5WuuKpJFT+vy7izUzow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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