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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20b0bc5f83224f6a78de2ea648b81c75154a5b00c05d7b61c75a4911a1b61453' 
  AND token = 'NM1mLuC5/JtTcALftK8Vj+l3NC+9oP2lmzyU/rpkJxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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