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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d45270dd96b3a0d1a7b095ba558ab86564cc334bb5376207b43a99f2bf0dffa' 
  AND token = 'Fu049LtdtX3Te21VpH4gp/mgnLf1P07ukEti77rwrMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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